Arsenic and old puzzles : a puzzle lady mystery

"When an elderly boarder at a Bakerhaven bed-and-breakfast drops dead during afternoon tea, there's nothing particularly suspicious about it--except for the Sudoku in his jacket pocket. But when a second body turns up in the window seat and an autopsy shows both men were poisoned with elderberry wine, the Puzzle Lady suspects she's dealing with a cold-blooded killer who for some reason is copying the Cary Grant movie Arsenic and Old Lace, in whic...